FM Transmitter program

[sharpdude]

Hey guys, I recently saw my friend play his cellphone through his radio w/o wires or adapters. He said it is a program that he had on his phone. Of course it was not a Treo wx or a PPC for that matter. I really don't remember what type phone but it wasn't one from here. Anyway, anybody know of an FM Transmitter hack or program that could be used with our phones? Any help would be useful.

PS I will also post this in the Treo wx forum for us treoheads!!

PM me if you know of one that is superb